iRhythm Ownership | Who Owns iRhythm?

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iRhythm Ownership Summary

iRhythm is owned by 24.24% institutional investors, 1.12% insiders, and 74.64% retail investors. Tudor investment corp et al is the largest institutional shareholder, holding 63.31% of IRTC shares. Sands Capital Global Growth Equity is the top mutual fund, with 4.68% of its assets in iRhythm shares.

IRTC Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	iRhythm	24.24%	1.12%	74.64%
Sector	Healthcare Stocks	35.74%	11.83%	52.43%
Industry	Medical Device Stocks	36.65%	11.46%	51.88%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Tudor investment corp et al	20.00M	63.31%	$27.45M
Vanguard group	3.31M	10.29%	$587.42M
Blackrock funding, inc. /de	2.74M	8.57%	$323.55M
Blackrock	2.50M	8.03%	$269.35M
Rtw investments, lp	1.67M	5.21%	$196.92M
Millennium management	1.61M	5.02%	$189.78M
Artisan partners limited partnership	1.45M	4.53%	$171.24M
Fmr	1.36M	4.26%	$160.73M
Holocene advisors, lp	1.25M	3.90%	$147.37M
Ubs asset management americas	1.05M	3.27%	$123.62M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Ophir asset management pty	335.81K	4.62%	$39.63M
Braidwell lp	610.19K	2.40%	$72.01M
Kampmann melissa s.	22.01K	2.08%	$2.60M
Healthinvest partners ab	22.32K	2.02%	$6.26M
Rtw investments, lp	1.67M	1.96%	$196.92M
Rock springs capital management lp	261.75K	1.82%	$30.89M
First light asset management	168.12K	1.78%	$19.84M
Eventide asset management	760.83K	1.48%	$89.77M
Next century growth investors	169.31K	1.45%	$19.98M
Stephens investment management group	561.53K	0.91%	$66.27M

Top Buyers

Holder	Shares	% Assets	Change
Tudor investment corp et al	20.00M	0.05%	20.00M
Millennium management	1.61M	0.08%	781.64K
Fmr	1.36M	0.01%	733.15K
Holocene advisors, lp	1.25M	0.36%	565.09K
Rtw investments, lp	1.67M	1.96%	486.51K

Top Sellers

Holder	Shares	% Assets	Change
Sands capital management	-	-	-1.70M
Capital research global investors	509.59K	0.01%	-675.16K
Price t rowe associates inc /md/	35.69K	0.00%	-466.43K
Fiera capital	-	-	-381.64K
Champlain investment partners	-	-	-365.63K

New Positions

Holder	Shares	% Assets	Change	Value
Tudor investment corp et al	20.00M	0.05%	20.00M	$27.45M
Vanguard fiduciary trust	223.70K	0.01%	223.70K	$26.40M
Bamco inc /ny/	183.90K	0.07%	183.90K	$21.70M
Susquehanna portfolio strategies	75.96K	0.13%	75.96K	$8.96M
Thrivent financial for lutherans	75.16K	0.02%	75.16K	$8.87M

Sold Out

Holder	Change
Coppell advisory solutions	-1.00
Wealthspire advisors	-1.00
National bank of canada /fi/	-1.00
Concord wealth partners	-1.00
Dunhill financial	-1.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Mar 31, 2026	137	-59.94%	7,757,583	-77.95%	24	0.20%	61	-59.87%	40	-67.74%
Dec 31, 2025	278	-20.11%	24,936,629	-28.15%	77	0.64%	122	-29.07%	98	-14.04%
Sep 30, 2025	333	5.38%	54,680,163	54.50%	169	1.35%	164	-2.38%	112	19.15%
Jun 30, 2025	316	18.35%	35,390,802	-1.62%	112	0.86%	169	26.12%	93	9.41%
Mar 31, 2025	8	-96.69%	1,629,968	-95.25%	5	0.04%	4	-96.43%	4	-95.35%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Sands Capital Global Growth Equity	1.51M	4.68%	-488.05K
Vanguard US Total Market Shares ETF	1.01M	3.21%	68.62K
Canada Life US Small-Mid Cap Growth A	1.00M	3.19%	-41.02K
Vanguard Total Stock Mkt Idx Inv	1.03M	3.14%	3.07K
iShares Russell 2000 ETF	748.85K	2.28%	6.30K
Vanguard Small Cap Index	742.72K	2.26%	-1.64K
Capital Group New Economy Comp	625.22K	1.93%	-
American Funds New Economy A	625.22K	1.93%	-
Fidelity Select Medical Tech and Devcs	485.00K	1.48%	117.00K
Eventide Gilead N	464.25K	1.44%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
May 11, 2026	TALWALKAR ABHIJIT Y	-	Sell	$270.61K
May 11, 2026	TALWALKAR ABHIJIT Y	-	Sell	$109.09K
May 11, 2026	TALWALKAR ABHIJIT Y	-	Buy	$56.89K
May 11, 2026	TALWALKAR ABHIJIT Y	-	Sell	$75.10K
May 11, 2026	TALWALKAR ABHIJIT Y	-	Sell	$136.67K

Insider Transactions Trends

Date	Buy	Sell
2026 Q2	1	6
2026 Q1	-	37
2025 Q4	-	10
2025 Q3	-	17
2025 Q2	-	8

IRTC Ownership FAQ

Who Owns iRhythm?

iRhythm shareholders are primarily institutional investors at 24.24%, followed by 1.12% insiders and 74.64% retail investors. The average institutional ownership in iRhythm's industry, Medical Device Stocks, is 36.65%, which iRhythm falls below.

Who owns the most shares of iRhythm?

iRhythm’s largest shareholders are Tudor investment corp et al (20M shares, 63.31%), Vanguard group (3.31M shares, 10.29%), and Blackrock funding, inc. /de (2.74M shares, 8.57%). Together, they hold 82.17% of iRhythm’s total shares outstanding.

Does Blackrock own iRhythm?

Yes, BlackRock owns 8.03% of iRhythm, totaling 2.5M shares as of Jun 2024. This represents 0.01% of BlackRock's total assets, with a market value of 269.35M$. In the last quarter, BlackRock increased its holdings by 61.23K shares, a 2.51% change.

Who is iRhythm’s biggest shareholder by percentage of total assets invested?

Ophir asset management pty is iRhythm’s biggest shareholder by percentage of total assets invested, with 4.62% of its assets in 335.81K iRhythm shares, valued at 39.63M$.

Who is the top mutual fund holder of iRhythm shares?

Sands Capital Global Growth Equity is the top mutual fund holder of iRhythm shares, with 4.68% of its total shares outstanding invested in 1.51M iRhythm shares.

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